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《Opto-Electronic Engineering》 2008-07
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Focusing Evaluation Method Based on Edge Tracking

LIU Li-shuang1,SUN Shuang-hua2,Lü Nai-guang1,DENG Wen-yi1 ( 1. School of Optoelectronic Information & Telecommunication Engineering, Beijing Information Science and Technology University, Beijing 100192, China; 2. Division of Metrology in Length and Precision Engineering, National Institute of Metrology, Beijing 100013, China )  
In image measurement system, accurate focusing is critical for high precision measurement. For image focusing, a focusing evaluation function is introduced to verify whether the image is in focus or not. When the edge of a work does not lie in a plane perpendicular to the vertical direction, it is difficult to focus correctly with conventional focusing evaluation functions. So a focusing evaluation method is proposed based on the edge tracking. Firstly, the edge of interest is extracted with edge tracking. For each edge point, sums of gradient square within a certain area along the edge direction are calculated and the focusing evaluation function is the sum of the sums of gradient square. When the focusing evaluation function reaches its maximum, the edge is in focus. Experimental results show that, when the edge of a work does not lie in a plane perpendicular to the vertical direction, it can be focused correctly with the proposed method.
【Fund】: 国家自然科学基金项目(50675015);; 北京市属市管高等学校人才强教计划资助项目(PXM2007_014224_044674)
【CateGory Index】: TP391.41
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